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Interior view showing an astronomer on a flight of stairs with one hand on the wall-mounted 10 foot quadrant with a telescopic sight designed for the old Royal Observatory building by Robert Hooke. A table with an inkwell, dividers and a straight rule can be seen below. Plate 3 (right half detail) from Ichnographia speculae Regiae Grenovici exquisite facta (London, 1676) a series of engravings commissioned by Sir Jonas Moore, the leading force in the construction and equipping of the original Royal Greenwich Observatory. The plate bears the inscription: "Quadrans Muralis Merid: 10 pedum Rad:.". Sir Jonas Moore (1617-1679) mathematician and patron of astronomy was elected a Fellow of the Royal Society in 1674.